Paper Title:
Investigation of Interatomic Potential on Chip Formation Mechanism in Nanometric Cutting Using MD Simulation
  Abstract

Nowadays, the nano-machining process is used to produce high quality finished surfaces with precise form accuracy. To understand and analyze the chip formation mechanism of nano-machining process on an atomistic scale, since the experimentation is not an easy task, numerical simulation such as molecular dynamic (MD) simulation is a very useful method. In this paper, MD simulation of the nano-metric cutting of single-crystal copper was performed with a single crystal diamond tool. The model was solved with both pair wise Morse potential function and embedded atom method (EAM) potential to simulate the inter-atomic force between the work-piece and a rigid tool. The chip formation mechanism, dislocation generation, tool forces and generated temperature were investigated. Results show that the Morse potential cannot perform an appropriate defect formation and plastic deformation in nano-metric cutting of metals. Also, tool forces in Morse potential are more than the forces in EAM potential. Furthermore, the fluctuations of resultant forces in Morse potential are greater than that of EAM. In addition, using many-body interaction potentials like EAM can lead to substantial changes in surface energies, elastic-plastic properties and atomic displacement, compared with the pair-wise potentials like Morse. Finally, the atomic displacement investigation shows that in EAM potential study, only the atoms in a local region near the cutting process are displaced, but in Morse potential a large portion of atoms has affected during cutting process. Subsequently, the chip temperature in EAM potential is more than that of Morse potential.

  Info
Periodical
Defect and Diffusion Forum (Volumes 312-315)
Edited by
Andreas Öchsner, Graeme E. Murch and João M.P.Q. Delgado
Pages
983-988
DOI
10.4028/www.scientific.net/DDF.312-315.983
Citation
S. Vahid Hosseini, M. Vahdati, A. Shokuhfar, "Investigation of Interatomic Potential on Chip Formation Mechanism in Nanometric Cutting Using MD Simulation", Defect and Diffusion Forum, Vols. 312-315, pp. 983-988, 2011
Online since
April 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Jia Chun Wang, Ji Min Zhang, Na Li, Yun Peng Kou
Abstract:In nanometric cutting process, the actual material removal can take place at atomic level, which makes it difficult or impossible to observe...
368
Authors: Seyed Vahid Hosseini, Mehrdad Vahdati, Ali Shokuhfar
Abstract:Today, there is a need to understand the micro mechanism of material removal to achieve a better roughness in ultra precision machining...
977
Authors: Akinjide Oluwajobi, Xun Chen
Materials Characterisation and Processing
Abstract:The effect of interatomic potentials on the onset of plastic deformation in the nanometric machining of a crystalline diamond tool on a...
330
Authors: Akinjide O. Oluwajobi, Xun Chen
Abstract:There is a need to choose appropriate interatomic empirical potentials for the molecular dynamics (MD) simulation of nanomachining, so as to...
194